NO ALUMINUM vs. FULL COVERAGE OF ALUMINUM – Controlled experiments have shown that covering the tubing with medium/thin gauge aluminum plates causes the system to put out about 60% more heat when operated at the same temperature.
If you use no aluminum at all, you must either raise temperature of the fluid in the tubes to a very high level, use more tubing, or both. It is not desirable to operate plastic heat exchanger tubing at high temperatures for reasons of safety, efficiency and service life.
